package main

import (
	"log"

	"github.com/fsnotify/fsnotify"
)

// WatchPath establishes a watch on the provided path
func WatchPath(path string) {
	/*
	   29044  2016-09-21 12:40:21 cd x
	   29045  2016-09-21 12:40:25 touch file
	   29046  2016-09-21 12:40:39 rm file
	   29047  2016-09-21 12:40:42 touch file
	   29048  2016-09-21 12:40:50 echo farts > file
	   29049  2016-09-21 12:40:57 rm file

	   produces:
	   $ ./sync_pass x
	   2016/09/21 12:40:25 event: "x/file": CREATE
	   2016/09/21 12:40:25 event: "x/file": CHMOD
	   2016/09/21 12:40:39 event: "x/file": REMOVE
	   2016/09/21 12:40:42 event: "x/file": CREATE
	   2016/09/21 12:40:42 event: "x/file": CHMOD
	   2016/09/21 12:40:50 event: "x/file": WRITE
	   2016/09/21 12:40:50 modified file: x/file
	   2016/09/21 12:40:50 event: "x/file": WRITE
	   2016/09/21 12:40:50 modified file: x/file
	   2016/09/21 12:40:57 event: "x/file": REMOVE
	*/
	watcher, err := fsnotify.NewWatcher()
	if err != nil {
		log.Fatal(err)
	}
	defer watcher.Close()

	done := make(chan bool)
	go func() {
		for {
			select {
			case event := <-watcher.Events:
				log.Println("event:", event)
				if event.Op&fsnotify.Write == fsnotify.Write {
					log.Println("modified file:", event.Name)
				}
			case err := <-watcher.Errors:
				log.Println("error:", err)
			}
		}
	}()

	err = watcher.Add(path)
	if err != nil {
		log.Fatal(err)
	}
	<-done
}